Restoration of salt-marsh vegetation in relation to site suitability, species pool and dispersal traits

Authors

  • Mineke Wolters,

    Corresponding author
    1. Community and Conservation Ecology Group, University of Groningen, PO Box 14, 9750 AA Haren, the Netherlands; and
    2. Centre for Ecology and Hydrology, Monks Wood, Abbots Ripton, Huntingdon, PE28 2LS, UK
      Correspondence author. E-mail: h.e.wolters@rug.nl
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  • Angus Garbutt,

    1. Centre for Ecology and Hydrology, Monks Wood, Abbots Ripton, Huntingdon, PE28 2LS, UK
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  • Renée M. Bekker,

    1. Community and Conservation Ecology Group, University of Groningen, PO Box 14, 9750 AA Haren, the Netherlands; and
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  • Jan P. Bakker,

    1. Community and Conservation Ecology Group, University of Groningen, PO Box 14, 9750 AA Haren, the Netherlands; and
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  • Peter D. Carey

    1. Centre for Ecology and Hydrology, Monks Wood, Abbots Ripton, Huntingdon, PE28 2LS, UK
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Correspondence author. E-mail: h.e.wolters@rug.nl

Summary

  • 1Restoration of salt marshes on previously reclaimed land provides an excellent opportunity to study plant colonization and subsequent development of salt-marsh vegetation. Insight into the process of salt-marsh development can guide the design, implementation and evaluation of salt-marsh restoration schemes and help determine appropriate management strategies.
  • 2We evaluated the process of salt-marsh restoration at a species- and plant-community level and investigated how the sequence of species establishment is related to site suitability, availability of the target species in the local and regional species pools and dispersal traits.
  • 3It took approximately 5 years for species diversity in the restoration site to become similar to a local reference marsh. The annual species Salicornia spp. and Suaeda maritima colonized and reached maximum abundance first. Perennial species (Puccinellia maritima, Aster tripolium, Spartina anglica, Spergularia media, Atriplex portulacoides and Limonium vulgare) only started to colonize or increase notably in abundance after 3 years of restoration.
  • 4Plant composition at the highest elevation of the restoration site developed from an annual Salicornia community into a Puccinellia maritima salt marsh, which was similar to the local reference marsh. After 8 years, the lower elevations were still covered by annual Salicornia salt marsh despite the potential for the development of a Puccinellia community.
  • 5Salt tolerance appeared to be much more important in explaining the sequence of species establishment than the availability of the species in the local or regional species pools or dispersal traits.
  • 6Synthesis and applications. The prospect of salt-marsh restoration after de-embankment is good, with target species establishing spontaneously and vegetation succession taking place. Because most salt-marsh species are dispersed over short distances, it is important that a well-developed salt marsh is adjacent to the restoration site. The rate of salt-marsh development and species diversity appears to be affected mainly by surface elevation. Proper elevation in relation to tidal inundation is therefore a prerequisite for the successful restoration of salt-marsh vegetation after de-embankment.

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